Mount for electron discharge devices



' Jan. 3, 1950 K. H.- SIMPSON 2,493,555

MOUNT FOR ELECTRON DISCHARGE DEVICES Filed May 28, 1948 Suventor KENNETH H.3IMPSDN Gttorneg Patented Jan. 3, 1950 MOUNT:-FOR :EIiECTR-ON DISCHARGE DEVIGES Kenneth H. Simpson, Maplewood,"N.J., assignor to Radio Gorporation of America, a corporation of Delaware AppIicationMayZS, 1948, Serial -No. 29,727

14' Claims. (Cl.250-27.5)

The .present invention. relates to improvements .in electron.dischargedevices, and more particularly .to. electron discharge devices, utilizing a,. p1urality of electrode. assemblies.

Certain commercial types of electrondischarge devices include a entodeassembly supported bethe .upper mica in thelupper part of the mount and comprising an'anodeand ,a cathode. In devices of the type. discussed the cathode referred to comprises a filamentary element extending through both electrodeassemblies and servingas a common cathodetherefor. .Between thediodeanode and portions of the pentodeprojecting above the upper mica isprovided a box-type shield, closed on two sides, and effectively functioning .to electricallyisolate the assemblies. There is also positioned in the upper portion of the mount. a getter supported on.a getter loop. The. mountissupported from. a stem closing the lower end of the tube envelope.

The diode anode is supported on a U-shaped member, one leg of which .passes throughboth spacers for connection to a lead-in. tothe stem, and. the other leg of which .isshorterand passes through only theupper spacer for support thereby. The U-shaped member-has a transverse portion provided witha loop. to clear the filamentary cathode which extendsabove this member to engage a tensionhook. Inaddition to, serving. as:a support for .thediode anode, the U-shaped memher also serves to support a damper-bar enga ing the filament.

One of the problemsassociated with-a mount structure .ofthis typewherethe lead-insare takenlfrom. oneend only thereof, is to support the diode anode, thedamperbar, the getter-and'getter loop, and a cathode tensionhook-attheend of themount remote from the stem in suchza manner. asto insulate the diodeanodefrom thecathode witha minimum .of. supportmembers ior. the diode.

. .An expedient. heretofore ,practicedris to; provide an additional .rod support passing" through both spacers and connected ,to:a-.lead-.in in the stem. Inthe upper part of this .rod supportrismounted thevgetter .loop and filament tensionhook; the damper bar. being supportedwon the :transverse portion .of the. diode anode support member. The requirementfor an additionalrod support :for the getter loop. and tension .hockand the. :need for a damper bar, represent an added structure and assemblytime withconsequentraddedexpense in the.

"2 manufacture of electron dischargedevicesof this type. Furthermore, ,:.where the device is of the miniature type, it complicates manufacture, since it places anadditional burdenon the. spaceavailable therein.

It is therefore an objectof-my invention to.provide an improved electron discharge deviceof the kind described. in which the electrodeassemblies and supports are simplified.

Another objectof' the ..inv.en ti0n is to. simplify the structure of "dual...'e1ectrode assembly devices where one of the assemblies is supported above the other.

A further object is to eliminate the need for a separate supportfor they getter loop.

Another objectds to dispense with a. damper ,bar for the filamentary cathode bypositioning the filament tension hook in such amannerasto permit the upper spacer tov serveas adamper. means.

A still further object Zis'tO. accomplish a reorganization of the anode support, the getter support and the cathodetension ,hook support in an electron discharge..;device .in order to secure .an improved device.

Another. object is to.,.provide a novel support member that serves as an anode-support for a getter loop.

.A further object is to support the cathode tension hook on a member operating at cathode potential to thereby eliminate a separate connector between the upperend of the. cathode and its associatedlead-in in the base.

These andfurther objects and. advantages will become apparent as 'the'description proceeds.

Referring to the .drawing: v

Figure 1 shows. a side viewpartly'broken away of an electron discharge device employing the mount of the invention, and

Figure-2 shows atop-end view of the mount 11- lu'strated in Figure 1.

"Referring in moredetail to the drawing, there is shown inthetwo figures thereof a diodepentodemount enclosed ;in a miniature type envelope, which "represents one embodiment of the invention. 'fThis embodiment is selected solely for the purpose o1"illustrating the invention and is not to be regarded as a limitati-onthereof.

The diode-pento'de referredto includes an envelope -lfl which--may-be 'Of'ElfiSS, and a mount supported on stem I l,- and comprising-a pentode supported between upper 'and lower insulating spacers 12,13, adjacent-thestem, and a diode supported above the ugpperspacer l 2 and remote from'the stem. Lead-insto :both'the pentode'and thediode assemblies aretaken from'thestem' H.

is supported the anode l9.

The pentode includes a filamentary cathode 14, control grid l5, screen grid l6, suppressor grid [1,

' and anode l8. Each of the grids referred to are of wound construction, the turns thereof being supported on appropriate grid side rods.

The diode includes an anode IQ of flattened tubular form, and a cathode which comprises an upwardly extending portion of filamentary cathode M, the latter serving as a common cathode for the 'pentode and diode.

Between the diode and pentode electrode as semblies is provided a metallic shield 20, which functions to shield portions of the pentode assembly projecting above the upper spacer l2 from the diode assembly.

According to the invention, the diode-anode I9 is supported on a U-shaped member having two legs 2i, 22 and a transverse portion 23. Leg 2| 4 end the anode I9 is of flattened tubular construction and is mounted in such a manner that its major transverse axis is parallel to the plane in which the lateral extension referred to, occurs. This manner of mounting is accomplished according to the invention, in positioning the leg 2! to which the diode anode is fixed, in the plane *of the grid side rods of the pentode and of the that includes two important features, one of these extends through both spacers I2 and I3 for connection to a lead-in in the stem II. On this leg Leg 22 is shorter than leg 21 and extends through the upper spacer l2 only, for support thereby and for preventing rotation of leg" 2]. Since the anode I9 is fixed to leg 2|,as by welding,'a'positive support of leg 2| against rotation afiorded byjthe engagement of leg r22with1 upper spacer I2, serves to 'maintain the anode IS in a desired coaxial relationship with respect tothe mount. The transverse portion 23 of the U-shaped member" is in .the form of a loop which extends laterally of the mount as shown in Figure 2 and lies in a plane that is angularly disposed with respect to both the longitudinal'axis and a transverse axis of the'mount as shown in Figure 1. The looped form oftransverse portion 23, providesan appropriate support for getter 24 and a path required for'induced currents required in flashing the getteri Another important advantage of the structure of the transvers portion. 23 will be come clear as the description continues.

Another respect in which the diode-pentode is in accordance with the invention is represented by the support means for the filamentary cathode M. This support means includes an upwardly extending grid side rod Ha associated with suppressor grid l1 and representing an extension of one of the grid side rods serving this grid. A tab 25 is fixed. to the upper end of-rod Ila as by welding, and, a cathode tension hook 26 is in turn fixed to tab 25.} The tension hook 26 is of a length so that its end 27. to which filament .I4 is fixed extends to a position laterally of the mount that is in non-coaxial relation to portions of the filament l4 extending between spaces l2 andJ3, .Both of these spacers may be provided with a centrally. disposed aperture 28 having corner or bights and may be triangular as shown in .Figure 2.. Thenon-coaxial relation of the tension hook end portion 21 with the filament extending between thespacers referred to, results-in engagement by the filament with one of the bightsin theaperture in the upper spacer I 2. This engagement serves to dampen vibrations. thatmayoccur in the filament and eliminatesftheneed for a separate damper bar for this purpose.

To permit of-the angular relationship between the portion of the filament l4 extending between spacers l2 and I3, and the portion thereof extending above the upper spacer l 2, it is necessary that the upper portion referred to extend laterally of the mount.- This lateral extension of the filament requires care that'the'filament be out of; contactwith the diode, anode I9. To this features comprising the provision of a U-shaped support member for properly supporting an an-- ode of the device, and for providing a loop for supporting and flashing a getter. The other feature resides in a novel filament support whereby such support, is accomplished'by a suppressor grid side rod operating at cathode potential in association with a filament tension hook of predetermined length and an angularly apertured spacer member. These features cooperate to form a novel and improved electron discharge 30' device. Thus, the novel angulardisposition of the transverse portion 23 of the U-shaped support member is designed to afford suitable spacing between the upper part of the shorter leg. 22 and the tension hook tab 25 which enters into a plane of said leg, to, prevent a short circuit therebetween. Although these features of con struction may be utilized to advantage in an electron discharge devicehaving only one electrode assembly, they are particularly desirable in a device having a plurality of electrode assemblies. Various modifications may be'made in the embodiment herein described and illustrated without departing from the spirit of the invention, the scope of which is pointed out in the appended claims.

Whatis claimed is: l 1. A mount having a stem, an electrode assembly including an anode, a cathode, a support for said cathode, and a support for said anode having two legs and a transverse portion, said anode being supported on one of said legs only said transverse portion forming a loop and lying ina plane angularly disposed with respect to a major axis of saidmount, for displacement of said loop with respect to said'support for said cathode and a getter supported on said loop. 7

2. A mount having a stem and. a plurality of electrode assemblies disposed longitudinally thereof, one of said assemblies being positioned at the end of the mount remote'from the stem and including an anode, a cathode, a support for:

said cathode, and a support for said anode haying two legs and a transverse portion, said transverse portion forming a loop and lying in a plane;

angularly disposed with respect to a major axis of said mount for displacement from said anode and from said support for said cathode, and a:

getter supported on said loop.

3. A mount having a stem, an electrode assembly including an anode and a support for said anode having two legs and a transverse portion,

said anode being supported on one of said legs, only, said transverse portion forming a loop and lying in a plane ang'ularly disposed with respect" to the longitudinal and transverse axes. of said. mount for longitudinal and'transverse displace- .ment. ,:irom-.saidseanode, and agetter. supported ionisaidvloop.

- :4. A :mount ;havinga xstemrand a ipluralitycoi electrode assemblies inalongitudinalsarray, one of -.said-.rassemblies having ananode-rand r bein more remote from said stem thanxonebi the .other, of-' said rassemblies, said: .one of ;the other of said assemblies @being. supported "between two insulating? plates a/support for .said anodehaving -.two legs-; and transverse remember, one :ofvsa-id legs -being rlonger than the "other: and; extendin through '(saidtinsulating plates and 416111976011- :nected to'a:-lead=in,-the other-of said legs extendonlyv through :the; plate: (more: remote from said-stem, .said anode being. supported only. on .said: one of said @legs saidntransverse member forming, a loop and aegettersupported .on'said loop.

A .-mount I having 1 a stemande a plurality of electrode assemblies .in v longitudinal :arrayyona-of said .assemblles comprising-ea diode having: an anode, and: being more remote iromq saidstem than one .ofsthe, xOthEI'; of- ;said assemblies, said one of; the. :other f said:.:.assembliesibeing:.:supportedwbetween twozinsulatin plates, a support for said anode having two legs and a transverse member, one of said legs extending through, both. oi said insulating. platesand being connected to alead-in, the other .of [said legs extending through the plate more remote from said stem, saidanode being mounted to engage said one/of said legs only,,said transverse members forming a loop in a planethat is'langu-lar with respectto the longitudinal-axis andaztransverse axisot said mount, andagetter supported onlsai'd loop.

6.: A ,mount havin a stem,;,an: electrode-assembly including an anode and a filamentary cathode, a support for said anode having two parallel legs and a transverse portion, said anode being fixed to one of said legs, a support for said cathode, said support for said cathode and said one of said legs having ends remote from said stem and terminating in a common plane, the other of said legs having an end remote from said stem and disposed closer to said stem than said common plane, a loop in said transverse portion, and a getter mounted on said loop.

7. An electron discharge device having an envelope enclosing a mount, said mount being supported at one end of said envelope and including an anode, a support for said anode, including a pair of parallel legs, one bein shorter than the other, and a loop extendin between said legs, said anode being supported by one of said legs only, a getter support extending across said loop, a cathode filament within said anode, and a support extending parallel to said legs and supporting one end of said filament.

8. An electron discharge device having an envelope enclosing a mount, said mount being supported at one end of said envelope and including an anode, a support for said anode including a pair of parallel legs, one being shorter than the other, and a loop extending between said legs, said anode being supported by one of said legs only, a getter supported across said loop, said loop and getter lying to one side of said anode, a filamentary cathode within said anode, and a support extending parallel to said legs and supporting one end of said filamentary cathode.

9. An electron discharge device having an envelope enclosing a mount, said mount includingia spluralitypfv electrode .:.assem-blies--longitudinally: ;.dispo.sed with; respect to: each other,:one of:.said=;.assemb1ies including. atfilamentaryw cathode and ii anzan'ode :ssurrounding said zicathode, and a grid: rhetween; said cathode: and anoden a pair of (insulating spacer v,zmembers between which said anode, and grid'. are. positioned, said grid-having a side: rod extending tthroughsaid zone of said: spacers and having an: end supporting :the; extending .aend. of rsaid xcathodeea support modeextendingz through. said spacers, one endzofsaid support rod extending fromthe side bin-one, of said spacers :that. is oppositefrom: said anode and including a loop an anode surroundingtheextending. end of saidcathode and supported onesaide support rod, and a getter supported acrossusaid loop, said .filamentary cathodeextending.through said. one of said spacers,. said. loop. including .a portion adjacent said: 'side' rod closer. to said one of. said spacers than said-end of said'side'rod, wherebysaid loop is insulatingly spaced-.fromsaid cathode.

'10. An electron discharge devicev having an envelopeenclosing a'mountysaid mount including a plurality of electrode assemblies longitudinally disposedawith respectzto .each. other, one of said assemblies including a filamentary cathodeand an anode surroundingsaid cathode, and a grid betweenrsaid cathode: and anode, a; pair of insulating spacer members between which said anode and grid arepositioned; a support rod ex-' tending ithrough said spacersone end ofsaid rod extending from the side ofone=ofsaidspacers that is opposite fromsaidanode andincl-uding a loop,an anode supported ongsaidv support --r-od, said cathode-extending through saidilast .mentioned anode, and. a; getter supported across said loop, a cathode support, said loop being inclined from the longitudinal axis of said device for insulating spacing from said cathode support.

11. A mount having a stem and two electrode assemblies axially displaced, one of said assemblies comprising a diode and forming an end of said mount, said stem forming the opposite end thereof, said diode having an anode, a support for said anode, said support having two legs and a transverse member, one of said legs being connected to a lead-in in said stem, electrode support rods for the other of said assemblies lying in a common plane, said legs lyin in said plane, a common filamentary cathode serving both of said assemblies, support means for the upper end of said cathode, said means including an upwardly extending portion of one of said support rods, said support for said anode and said one of said support rods terminating in a common plane, a loop in said transverse member for preventing contact between said support for said anode and said one of said support rods, atab fixed to the end of said one of said support rods for supporting a cathode tension hook, said tab extending laterally into the plane of the other of said legs, the upper end of said other of said legs being disposed closer to said stem than said tab, whereby said tab and said other of said legs are insulatingly displaced from each other, and a getter supported on said loop.

12. A dual electrode mount having a stem, a diode and another electrode assembly disposed between said stem and diode, said diode having an anode and a cathode, said cathode also serving said another electrode assembly, a support for said cathode, said support having two legs and atransverse member, a suppressor grid for said another electrode assembly having a side rod,

7 7 said side rod and said two legs lying in a common plane, said side rod being disposed between said legs, the upper ends of said side'rod and said support lying in a common plane, said transverse member having a loop to avoid contact with said rod, a metal tab on said rod disposed'in said common plane and extending laterally-a greater distance than separates said rod and said one of said legs, the upper end of said one of said legs being closer to said stem than the upper end of said side rod, whereby said tab is displaced from said support, said tab being connected to a cathode tension hook, and a getter mounted on said loop.

13. An electron discharge device havin an envelope including a mount, said mount including a stem and a plurality of electrode assemblies spaced along the longitudinal axis of said device, a pair of spaced insulating spacer members disposed'in planes parallel to a transverse axis of said device, one of said assemblies being posi-' tioned between said members, a support rod extending through both of said members, said rod extending from the outer side of one of said members and being bent to provide a loop lying in a plane disposed angularly with respect to the longitudinal axis of said device and spaced from said side of said one of said members, the other of said assemblies including an anode, said anode being supported on said rod and extending into the plane of said loop, saidrod being farther bent to include a leg extending through said one of said members for preventing rotation of said anode, a getter supported on said loop, a filamentary cathode extending through said anode, and a support rod for said cathode extending from said outer side of said one of said members 7 8 and being adjacent saidleg, said last-named support rod extending-farther. from said side than said leg and terminating in a support end, said cathode being connectedto said support end, whereby said support end is insulatingly spaced from said leg. I V

14. A mount having a stem, anelectrode assembly including tubular anode and a filamentary cathode extending through said anode, a support for said anode, said support rod being fixed to one side of said anode and extending beyond the end of said anode remote from said stem, a support for said cathode radially spaced from said anode and diametrically disposed with respect to the anode support, said anode support being bent to provide a leg parallel to the cathode support and farther spaced from said anode support than said cathode support and disposedv in the plane of said anode support and said cathode support, said anode support being further bent to provide a loop spaced from said anode and inclined from the longitudinal axis of the mount for insulatingly spacing said loop from the oathode support, and a getter supported on said loop.

KENNETH H. SIMPSON.

REFERENCES CITED The following references areof record'in file of this patent:

UNITED STATES PATENTS the 

